Journal ArticleDOI
Double white dwarfs as progenitors of R Coronae Borealis stars and type I supernovae
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TLDR
In this article, the authors explored the role of mass transfer in the evolution of double degenerate systems and found that low-mass helium/helium pairs are unstable to dynamical time-scale mass transfer and probably coalesce to form helium-burning sdO stars.Abstract:
Close double white dwarfs should arise from the second phase of mass exchagne in close binaries which first encountered mass exchange while the more massive star was crossing the Hertzprung gap. Tidal mass transfer in these double degenerate systems is explored. The sequence of double white dwarf divides naturally into three segments. (1) Low-mass helium/helium pairs are unstable to dynamical time-scale mass transfer and probably coalesce to form helium-burning sdO stars. (2) In helium/carbon-oxygen pairs, mass transfer occurs on the time scale for gravitational radiation losses (approx.10/sup -4/ M/sub sun/ yr/sup -1/); the accreted helium is quickly ignited, and the accretor expands to dimensions characteristic of R CrB stars, engulfing its companion star. (3) Carbon-oxygen/carbon-oxygen pairs are again unstable to dynamical time-scale mass transfer and, since their total masses exceed the Chandrasekhar limit, are destined to become supernovae. Inactive lifetimes in these latter systems between creation and interaction can exceed 10/sup 10/ years. Birthrates of R CrB stars and Type I supernovae by evolution of double white dwarfs are in reasonable agreement with observational estimates.read more
Citations
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Journal ArticleDOI
i-process contribution of rapidly accreting white dwarfs to the solar composition of first-peak neutron-capture elements
Benoit Côté,Pavel A. Denissenkov,Falk Herwig,Ashley J. Ruiter,Christian Ritter,Marco Pignatari,Krzysztof Belczynski +6 more
TL;DR: In this paper, the authors used the metallicity-dependent contribution of RAWDs to the one-zone galactic chemical evolution code OMEGA according to RAWD rates from binary stellar population models combined with metallic-dependent i-process stellar yields calculated following the models of Denissenkov et al. They found that RAWDs could be responsible for a significant fraction of the solar composition of heavy elements in the Galaxy.
Journal ArticleDOI
The Relative Specific Type Ia Supernovae Rate From Three Years of ASAS-SN
J. S. Brown,Krzysztof Z. Stanek,T W-S Holoien,Christopher S. Kochanek,Benjamin J. Shappee,J. L. Prieto,J. L. Prieto,Subo Dong,Ping Chen,Todd A. Thompson,John F. Beacom,Maximilian Stritzinger,D. Bersier,J. Brimacombe +13 more
TL;DR: In this paper, the authors analyzed the 476 SN Ia host galaxies from the All-Sky Automated Survey for Supernova (ASAS-SN) Bright Supernova Catalogs to determine the observed relative Type Ia supernova (SN) rates as a function of luminosity and host galaxy properties.
Journal ArticleDOI
Population Synthesis of Hot Subdwarfs: A Parameter Study
TL;DR: In this article, a grid of binary population synthesis models using different assumptions about the minimum core mass for helium ignition, the envelope binding energy, the common-envelope ejection efficiency, the amount of mass and angular momentum lost during stable mass transfer, and the criteria for stable Mass Transfer on the red giant branch and in the Hertzsprung gap was computed.
Journal ArticleDOI
THE FATE OF Cyg X-1: AN EMPIRICAL LOWER LIMIT ON BLACK-HOLE-NEUTRON-STAR MERGER RATE
TL;DR: In this paper, the future evolution of Cyg X-1 was studied and it was shown that it will encounter a Roche lobe overflow episode, followed shortly by a Type Ib/c supernova and the formation of a neutron star (NS).
Journal ArticleDOI
Magnetic white dwarfs with debris discs
TL;DR: In this paper, a model for the disc evolution under the effect of magnetic accretion, and for the angular momentum evolution of the star, which can be compared with the observations, is presented.
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